A kind of cast iron pan with composite material as sand mold and its casting method

Abstract

The invention discloses a cast iron pot with a composite material as a sand mould and a casting method thereof. The casting method includes the steps that sand mould raw materials are weighed quantitatively and mixed evenly, then the materials are ball-milled and dried, a composite material sand mould is obtained, and the composite material sand mould is placed in a high-pressure container; cast iron blocks are fully heated and completely melted into molten iron, the molten iron is poured into the composite material sand mould, pressure in the pressure container is high pressure, a staged cooling means is adopted till the molten iron is completely cooled to room temperature to form castings, pressure continues to be maintained, and high pressure is relieved; the mould is taken out, the composite material sand mould is slowly removed by means of a metal tool, and the cast iron pot is obtained. Casting technologies, especially the improved casting technologies of improving a sand mould formula, improving pressure in a sand box, adopting the staged cooling means and the like, can greatly improve product quality of the cast iron pot and has certain economic and social meaning.

Description

technical field [0001] The invention relates to the field of casting, in particular to a cast iron pot using a composite material as a sand mold and a casting method thereof. Background technique [0002] Cast iron pans have a long history and a wide variety, and are loved by people for their advantages such as solid texture, low price, durability, uniform heat conduction, and the ability to be used on a variety of heat sources. Long-term cooking in a cast iron pan can increase the iron element necessary for the human body, and an oil film will be formed on the surface of the iron pan, which not only does not stick to the pan, has no adverse effects on the human body, but also avoids the potential impact of various harmful chemicals on the human body. However, because cast iron pans are easy to stick to the pan and the preparation process is backward, the quality of cast iron pans is not high, which affects the further development of cast iron pans. [0003] However, cast i...

AI Technical Summary

Problems solved by technology

[0004] At present, the main problems in the casting process of cast iron pots are: 1. The casting process of cast iron pots is a physical and chemical change process dominated by heat conduction. Due to the large temperature difference between the molten iron and the mold, there is residual heat in the casting process of cast iron pots. The stress is far greater than the tensile strength of the cast iron pan, which makes the cast iron pan prone to cracking and affects product quality

Second, during the casting process of cast iron pots, the sand mold also has a great influence on the product quality. If the sand mold is loose and has holes, it is easy to collapse, which will easily lead to deformation of the casting, and there are blisters or pores on the surface. If the sand mold density is too high, the thermal conductivity will be poor, resulting in There are bumps or cracks on the casting surface

Third, if the casting cools down too quickly during the cooling process, it will easily cause uneven density of the casting, resulting in a decline in the quality of the cast iron pot and affecting the performance of the product

However, the iron pot made by this patent has low structural strength, weak wear resistance, and is easy to damage

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